I am new to the developer force. I was a developer working on a billing product. Currently we are looking at saas domain. I need to work on integrating our pages in sales force. We are providing tabs in sales force which navigates to our portal and so user can do operations.  Here we need some help how to integrate the data between the portals.

1. Whenever a prospect customer converted to customer, information should be passed to our portal. How this can be achieved. Can any body share the approach and sample code if possible.

2. Can we access the session related information related to accounts, leads etc.,.Can we pass those as querystring to our portal. So that customer data will be automatically populated in the page instead of enterring the account number again.

I am looking forward on this.